Well considering Bayonetta already did that I don't think Capcom would want people to accuse them of ripping off Bayonetta.
So why not have Capcom rip off themselves namely DmC and Sengoku Basara. I'm surprised no one here considered giving Lucia Osiris and Aquila or angelic like weapons based off of Osiris (scythe) and Aquila (large shuriken). They carry over some of those weapons moves while having some unique moves (just really like some of those moves for those weapons to be honest). You can rename them if you want to separate them from DmC. Like scythe can be named Isis (since she is Osiris wife) but if Capcom wants to avoid association with the terrorist organization well since giving Lucia a scythe would give her an angel of death motif why not name it after an actual angel of death. So Azrael, Samael, Yama, Abaddon, Santa Muerte, Mot, etc would make good names.
As for the Shurikens since Aquila means eagle you can name it after a mythical bird like say Roc, Garuda, Minokawa, Tengu, Thoth, or keeping to the constellation idea (since Aquila is also a constellation) why not Cygnus (swans match Lucia more than eagles).
As for moveset a combination of stuff from Osiris and Aquila with some new stuff and some stuff from Sengoku Basara namely
Sasuke,
Kasuga, and
Kotaro well mostly for the shurikens. These 3 are a good reference point and since SB takes heavily from DMC (well its made by the same team) and DMC takes from it too especially with DMC4 SE and even DMC5 and playing SB you see a lot of neat weapons and ideas that could be utilized in DMC. I like how Sasuke's Shuriken is tied to a string so it acts like a yo-yo. I guess Kasuga can be more of reference for range/projectile and some hand to hand. Not so sure about the scythes full moveset. I could do a moveset breakdown for the weapons later and maybe a possible control scheme that would be nice.